Update logger service channel name

[dubbs]

This looks like it should be acme instead of app.

[xabbuh]

I think I would change the channel in the config examples to app instead. What do you think?

[HeahDude]

Hello @dubbs, good catch for this first contrib.

I agree with @xabbuh, would you like to update your PR accordingly? Thanks!

[dubbs]

Sure, I'll change the example from acme to app.

[javiereguiluz]

@dubbs we're sorry it took us so long to merge your contribution. We ended up solving it differently, but you discovered and reported the bug, so thank you!